Spanning an area of 147,040 square miles, Montana is the fourth largest state in the United States. There are 56 counties in the state. Beaverhead,
Deer Lodge, Gallatin, Jefferson, Lewis & Clark, Madison, Missoula, and Chouteau were the original counties when the Montana Territory was created in 1864. The area of Yellowstone National Park comes under Gallatin County and Park County.
Covering an area of 5,543 square miles, Beaverhead County is the largest county in Montana. Silver Bow County in southwestern Montana is the state's smallest county by area. With more than 155,000 inhabitants, Yellowstone County is the most populous county in the state. Petroleum County was the last county out of 56, founded in 1925. It is also the least populous county in Montana. Daniels County in northeastern portion of the state is considered one of the most rural counties in the US.
MOW.DT.12.9.16
| County Name | Population | Area (sq. mi.) |
|---|
| Beaverhead County | 9202 | 5542.31 |
| Big Horn County | 12671 | 4994.81 |
| Blaine County | 7009 | 4226.18 |
| Broadwater County | 4385 | 1191.35 |
| Carbon County | 9552 | 2047.99 |
| Carter County | 1360 | 3339.57 |
| Cascade County | 80357 | 2697.9 |
| Chouteau County | 5970 | 3973.24 |
| Custer County | 11696 | 3783.13 |
| Daniels County | 2017 | 1426.09 |
| Dawson County | 9059 | 2373.14 |
| Deer Lodge County | 9417 | 736.98 |
| Fallon County | 2837 | 1620.33 |
| Fergus County | 11893 | 4339.17 |
| Flathead County | 74471 | 5098.34 |
| Gallatin County | 67831 | 2605.84 |
| Garfield County | 1279 | 4668.06 |
| Glacier County | 13247 | 2994.72 |
| Golden Valley County | 1042 | 1175.3 |
| Granite County | 2830 | 1727.44 |
| Hill County | 16673 | 2896.36 |
| Jefferson County | 10049 | 1656.64 |
| Judith Basin County | 2329 | 1869.85 |
| Lake County | 26507 | 1493.77 |
| Lewis and Clark County | 55716 | 3460.96 |
| Liberty County | 2158 | 1429.76 |
| Lincoln County | 18837 | 3612.67 |
| McCone County | 1977 | 2642.53 |
| County Name | Population | Area (sq. mi.) |
|---|
| Madison County | 6851 | 3586.54 |
| Meagher County | 1932 | 2391.82 |
| Mineral County | 3884 | 1219.82 |
| Missoula County | 95802 | 2597.97 |
| Musselshell County | 4497 | 1867.15 |
| Park County | 15694 | 2802.41 |
| Petroleum County | 493 | 1653.9 |
| Phillips County | 4601 | 5139.57 |
| Pondera County | 6424 | 1624.7 |
| Powder River County | 1858 | 3297.18 |
| Powell County | 7180 | 2325.94 |
| Prairie County | 1199 | 1736.55 |
| Ravalli County | 36070 | 2394.21 |
| Richland County | 9667 | 2084.09 |
| Roosevelt County | 10620 | 2355.6 |
| Rosebud County | 9383 | 5012.37 |
| Sanders County | 10227 | 2762.17 |
| Sheridan County | 4105 | 1676.58 |
| Silver Bow County | 34606 | 718.31 |
| Stillwater County | 8195 | 1795.09 |
| Sweet Grass County | 3609 | 1855.08 |
| Teton County | 6445 | 2272.61 |
| Toole County | 5267 | 1910.95 |
| Treasure County | 861 | 978.86 |
| Valley County | 7675 | 4921 |
| Wheatland County | 2259 | 1423.09 |
| Wibaux County | 1068 | 889.31 |
| Yellowstone County | 129352 | 2635.15 |
Map of All Counties in Montana |
|---|
Last Updated on: December 12, 2016
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